The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 1997
Filed:
Jul. 19, 1996
Applicant:
Inventor:
Naoki Tomisawa, Atsugi, JP;
Assignee:
Unisia Jecs Corporation, Kanagawa-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ; F02M / ; G01M / ;
U.S. Cl.
CPC ...
731181 ; 73116 ; 340439 ; 36443105 ;
Abstract
In an internal combustion engine equipped with a mechanism for improving combustion such as a swirl control valve, the air-to-fuel ratio of the combustion mixture gas is increased until the stability of the engine reaches an allowable limit under the condition where the combustibility is to be improved by the mechanism for improving combustion. When the air-to-fuel rate at the allowable limit is equal to or smaller than a reference air-to-fuel ratio, whether or not the mechanism for improving combustion is defective is diagnosed.